Metal-concrete reinforced floor.



R. THOMSON.

METAL CONCRETE REINFOBQED FLOOR.

APPLICATION FILED APR. 5.1913.

Patented June 17, 1913.

7 Jimm ROBERT THOMSON, OF POLLOKSHIELDS, GLASGOW, SCOTLAND.

METAL-CONCRETE REINFORCED FLOOR.

Specification of Letters Patent.

Patented June 17,1913.

Application filed April 5, 1913. Serial No. 759,054.

,Toall whom it may'concem Be known that I, ROBERT THOMSON a sub'ect ofthe King of Great Britain and- Ire and and a resident of Pollokshields,Glasgow, Scotland, have invented certain new and useful-Improvements inMetal-Concrete Reinforced Floors, and of which the following is thespecification.

The invention relates to metal-concrete reinfoi ced floors of the knowntype in which a series ofprimary reinforcing members are secured toanchor rings carried on supporting- -dev ces, whlch in turn are carriedupon the columns supporting the floor. The greatest stress upon thefloor is that. substantially vertical at and about the point ofsupport-hence, if, with the construction referred to, adequate strengthbe provided at these points, more strength more material-than isnecessary is provided in the span of the floor where the stresses arenot so great.

The invention has for its object to provide additional sources ofstrength in the neighborhood of the point of support-thus material ofonly adequate strength as regards the span parts may be used, it beingpro vided with additional strength at the points of support where addedstrength is required. Therefore there follows a saving in material.Further, as, for a given strength of floor, the number of primaryreinforcing rod members may be thus reduced, the diameter of rest on thesupporting device but lies immediately beneath the primary tensionalmembers, and is supported during construction in any convenient manner.hen the floor is completed, the subsidiary ring is adequately supportedby the concrete in which it is embedded. To this subsidiary anchor ringare connected-conveniently by hook ends formed on them and engaging theringsubsidiary 'tensional reinforcing rod members. These rod membersextend outward in a substantially radial direction from the point ofsupport an adequate distance to take their portion of the vertical orsubstantially vertical load-that is to say, preferably to a distanceslightly beyond the point of contraflexure in the floor. They may lie inthe same horizontal plane as the primary rod members, or they may extendout substantially parallel with the floor surface beneath which they areembedded. According to one example, they are bent upon themselves andreturn radially inward and downward to butt against the central anchorring supporting device engaging the column top. Thus they formcantaliver brackets each-with its upper leg in tension and its lower legin compression.

At or near the point of contraflexure of the floor one or more rings arepreferably provided enmeshed within the subsidiary rod members andbetween them and the primary members. Vhen two rings are used one isplaced above and one below the latter.

These rings may carry the outer ends of the and separate rods incompression butting the anchor support and lying upon the lower of therings be provided. Alternatively, or in addition, such separatecompression rods may be used at intervals around the whole centralstructure to assist the concrete in resisting compression.

The anchor ring supporting device is strengthened by internal radialribs, and

integral therewith and fitting between these and the column core theremay be a ring to prevent fiexure of the depending part of the device andso avoid disturbance of the concrete inwhich it is embedded.

In order that the. invention and the manner of performing the same maybe properly' 'of a floor to show an example of the invention.

As'shown in the drawings, there is a series of primary reinforcing rodmembers a, for the span of the floor, the ends of which are hooked overanchor rings 6, carried on external radial webs f, on a hub-likesupporting device 0, which in turn is carried upon a column (I,supporting-the floor.

The column (Z is shown as of the known composite type in which there isan axial metallic core 6 and series of rings 9 arranged radially andeccentrically about the core, but it is to be understood that otherforms of composite column may be used in which there either a singlecore or a group of cores. I

According to the invention, there is provided a second or subsidiaryanchor ring it concentric with but of greater diameter than thatoriginal anchor ring member I) to which the primary tensional members aare secured. This subsidiary ring. member h is not carried by thesupporting device but lies immediately beneath the primary ten sionalmembers a, and is supported during construction in any convenientmanner.

\Vhen the floor is completed, the subsidiary I ring it is adequatelysupported by the concrete in which it is embedded. To this subsidiaryanchor ring it are connectedconveniently by book ends formed on them andengaging the ring subsidiary reinforcing rod members j. These rodmembers are preferably disposed in groups arranged radially andintermediate between the groups of primary reinforcing rod members a.They extend out substantially radially from the column-support anadequate distance to take their portioh of the vertical or substantiallyvertical loadthit is to say, to a point slightly beyond'the point ofcontraflexure of the floor; and they are substantially parallel with thefloor surface (Fig. 2) beneath which they are embedded.

The rod members j are bent upon themselves and return radially inwardand downward to butt against the cylindrical depend ing periphery, 7c,and the webs, of the supporting device 0 engaging the top of the lowercolumn d. Thus the rod members j form cantaliver brackets each with itsupper leg (hooked to. the ring it) in tension, and its lower leg(butting against the pe riphery of the supporting device 0) incompression.

At or near the point of contraflexure of the floor, rings, Z, on, areprovidedenmeshed within the subsidiary rod members 9' and between themandthe primary members 02 one above and one below the latter, theserings being supported in any convenient manner when the parts are beingassembled and the concrete applied.

Separate compression rods n butting the periphery 7c of the anchorsupport 0 and lying upon the lower of the rings 1, m, extend atintervals around the whole central structure.

The anchor ring-supporting device 0, 1c, is strengthened in known mannerby internal piece withthe lower inner edges of these ribs to strengthenthe parts and prevent fiexure of the depending part is of the device,and so disturbance of the concrete in which it is embedded, the ring "1'being of sufficiently greater diameter than the core 6 of the column (Zto give room for a substantial layer of concrete between it and thecore.

lyliat I claim is I '1. "In a'metal-concrete reinforced floor havingradially disposed groups of primary reinforcing rod members secured to aprimary anchor ring carried on a central supporting device carried inturn on a column; a second and subsidiary anchor ringv of greaterdiameter than theprimary anchor ring and disposed beneath the primaryrod- -members, and subsidiary rod-members arranged in radially disposedgroups intermediate between the groups of primary rodmembers someextending horizontally and radially outward frointhe secondary ring tothe point of contrafiex'ure of the floor and some extending radiallyinward and downward from that point. to the central supporting device.

In a metal-concrete reinforced floor having radially disposed groups ofprimary reinforcing rod members secured to a primary'anchmr ring carriedon a central supporting device carried in turn on a column; a second andsubsidiary anchor ring of greater diameter than the primary anchor ringand disposed beneath the primary rodmembers, subsidiarv rod-membersarranged radially disposed groups intermediate between the groups ofprimary rod-members, some extending horizontally and radially outwardfrom the secondary ring to the point of contraflexure of the floor, andsome extending radially inward and downward from that point to thecentral supporting device, and ring supporting means enmeshed betweenthe primary rod-members and the outer ends of the subsidiaryrod-membels.

3. In a metal-concrete reinforced floor having radially disposed groupsof primary reinforcing rod members'secured to a primary anchor ringcarried on a central supporting device carried in turn on a column; asecond and subsidiary anchor ring of greater diameter than the primaryanchor ring and disposed beneath the primary rodmembers, and subsidiaryrod-members arranged in radially disposed groups interme-- diate betweenthe groups of primary rodmembers, some extending horizontally andradially outward from the secondary ring to the point of contraflexureof the floor, and some extending radially inward and downward from thatpoint to the central supporting device, the pairs of outwardly andinwardly extending subsidiary rod members K being joined at their outerends.

radial ribs p, and a ring 1* is formed in a l 4. In a metal-concretereinforced floor having radially disposed groups of primary reinforcingrod members secured to a primary anchor ring carried on a centralsupporting deyice carried in turn on a column; a second and subsidiaryanchor ring of greater diameter than the primary anchor ring anddisposedbeneath the primary rodmembers, subsidiary rod-members arrangedin radially disposed groups intermediate between the groups of primaryrod-members, some extending horizontally and radially outward from thesecondary ring to the point of contraflexure of the floor, and someextending radially inward and downward from that point to the centralsupporting device, the pairs of outwardly and inwardly extendingsubsidiary rod members being joined at their outer ends, and ringsupportin means enmeshed between the primary ro d-members and the outerends of the subsidiary rod-members. r

5. In a metal-concrete reinforced floor having radially disposed groupsof primary reinforcing rod members secured to a primary anchor ringcarried on a central supporting device carried in turn on a column; asecond and subsidiary anchor ring of greater diameter than the primaryanchor ring and disposed beneath the primary rod- 'members, subsidiaryrod-members arranged in radially disposed groups intermediate betweenthe groups of primary rod-members,

some extending horizontally and radially outwardffrom the secondary.ring to the point of contraflexure of the floor, and some extendingradially inward and downward from that point to the central supporting.device, ring supporting means enmeshed between the primary rod-membersand the outer ends of the subsidiary rod-members, and additionalcompressional rod members in groups and extending radially inward anddmvnward from the ring supporting means to abut against the centralsupporting device.

6. In a metal-concrete reinforced floor having radially disposed groupsof primary reinforcing rod members secured to a primary anchor ringcarried on a central supporting devicecarried in turn on a column; asecond and subsidiary anchor ring of greater diameter than the primaryanchor ring and dis )osed beneath the primary rodmembcrs. su sidiaryrod-n'rembcrs arranged in radially disposed groups intermediate betweenthe groups of primary rod-members, some extending horizontally andradially outward from the secondary ring to the point of contraflexureof the floor, and some extendingradially inward and downward from thatpoint to the central supporting device, the pairs of outwardly andinwardly extending subsidiary rod members being joined at their outerends, and ring supporting means enmeshed between the primary rod-membersand the outer ends of the subsidiary rod-members, and additionalcompressional rod members in groups and extending radially inward anddownward from the ring supporting means to abut against the centralsupporting device.

In testimony whereof I have signed my name to this specifi 'ation, inthe presence of two subscribing witnesses.

' ROBERT THOMSON. Witnesses:

Davin FERGUSON, WILFRED HUNT.

